请问这个报错是怎么回事呀？

PRCEnderman

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ValueError: Dimension 0 in both shapes must be equal, but are 7 and 8. Shapes are [7,7] and [8,8]. for 'concat_4' (op: 'ConcatV2') with input shapes: [?,512,7,7], [?,512,8,8], [] and with computed input tensors: input[2] = <1>.